Role of a Saprophytic Basidiomycete Soil Fungus in Aggregate Stabilization
نویسندگان
چکیده
*T. C. Caesar-TonThat and V.L. Cochran, USDA-ARS Northern Plains Agricultural Research Laboratory, 1500 North Central, Sidney, MT 59270 *Corresponding author: [email protected]. ABSTRACT Loss of water stable aggregates due to excessive tillage has increased the potential for soil erosion in semiarid farming-systems. Fungi can be responsible for the resistance of soil aggregates to breakdown upon wetting. We studied the effects of a saprophytic lignin decomposer basidiomycete isolated from plant litter on soil aggregation and stabilization. The basidiomycete produces large quantities of non water-soluble extracellular materials that bind soil particles into aggregates. Water stability of aggregates amended with the fungal mycelia and the degree of biodegradation of the binding agents by native soil microorganisms was determined by the wet sieving method. Data demonstrated that fungal amended aggregates supplemented with a source of carbon (millet or lentil straw) were much more water stable and resisted microbial degradation longer than when they were prepared with fungal homogenates alone.
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